Speed-changing mechanism



June 3, 1930. c, SCHAEFFER 1,762,080

SPEED CHANGING MECHANISM 7 Filed April 16, 1929 2 sheets-sheet 1 a b dc e l I :1

INVENTOR RTT RN EY5 Jun 3, 1930.

c. SCHAEFFER 1,762,080

SPEED CHANGING MECHANISM Filed April 16, 1929 2 Sheets-Sheet 2 INVENTOR Charles :Scfiaef/er HTT RNEYb one set Patented June 3, 1930 I UNIT- E STATES P TENT-7' o tica 1 CHARLES SGHAEFFEEQF *rARIs, FRANCE, -nss1noi=v To soeIE'rE AN NSIME" 'ims" ANcmNsEThBmssEMENTs PANHARD & LEYASSORfOFPABIS, FRANCE? SPEED-UHANGING Mnoneiusm Applicatidn file d April 1e,- i929, sen-a1 no. 355,589, and in France 'A rii '2 1,19 2's.

In such change gears as'are 'employedon motor vehicles or "like: apparatuses there are generally provided four different direct running speeds, one of which is obtained through direct drive, and one back running speed.- To secure 'the four direct running speeds, there are employed four sets "of gears which compriseone so-called transmission set and through directflrive. h V y i It follows'that ei ht gears 'are used for-direct runningopl-yq' This inventlonrunning lsp eedsylfith'three" pairs or gears only.

Withthisbbject in View, in contradistinction to what Was dOne heretoforefthetrans 'mission gears do "not serye only as but 7 are used in such manner that they themselves" contribute to speed reduction 5 It follows'that transmission Wheels proper are no longerpro- Vided;

The transmission Wheel is loosely mounted upon the second motiojn shaft instead of being' rigidly 1 connected thereto, and one geanof each pair is likewise loosely mounted upon its shaft; thesevarious gears inay alternatively be made rigidwitlitheir shafts through suitable means;

The appended drawing shoyvs by Way of example a'nembodiment of the subject matte r of the invention wherebyfour'direct'running speeds may be obtained by means of three) H H M v V I r the c 'as iiig thfughball bearing 25 nd' pairs of gears.

3 Figure l 1- 1s a" vertical cross "sectional View of sucharraI'igementconditions'" for each ofth'e'first, second anol'fthird speeds, the fourth speed" being obtained has for its object "a gear arrangement whereby speed changing deice'mayb designedwhioh g'iy'es'fou'r direct I M p y W p upon a sleeve '16are'adaptedj to ngage Th X 7 t n raid a a l w iheen agme a" p n it1 wh -wh h is ri id y i connectedto"thesecond inotionshaft 311:0 be

th ngine, 2 being' the drii en shaft w l former; intermediate shaft 3 is arranged between the driving shaft and 'th'e 'jdriven shaft, andis centered therewithjby means, of cylindrical"projections 4 and 5 which are The shafts "1 and are; mounted through ball" bearings-'6 and 7 infaj easin 8 ,Theinter'mediate haft a "at t may be obtainedthrough sleeye: I by? l' r i i uponthe clri'yeiishaft, is p'royided holes T The pinion 2'Z is likewise concured upon the second-motion" shaft? "It r a WheeTSOyvhi chisrlooselyimounttl uponlthe Figure" 3 indicates *those "eombinati'ons' which it is possible to obtain With' a comple' ment'ary set' of gears? I 1 In the" embodiment showman Figure 1, 1'

' tions the three pairs of gears allowing the direct running speeds to be secured; the vertical lines (Z relate to back running. 7 V V t The horizontal line 6 represents the intermediate shaft which carries the pinion (Z for back running, which pinion is not shown in Fig. 1. I

The horizontal linese and f diagrammatically show in their respective positions the shafts of the mechanism.

A, B, C, D, E diagrammatically indicate theconnections of the various gears with their shafts, corresponding to the four direct running speeds and back running.

In throwing into gear of any one of the speeds the procedure is as follows In setting up the fourth speed or direct drive A, the sleeves 16 and 18 are thrust toward the left, whereby on one hand the fingers 14 are'made to engage into recesses 13, thus rigidly connecting the driving shaft 1 and the intermediate shaft 3 with each other, and on the other hand the sleeve 18 is placed into an overlapping position with respect to corrugations 17 and 19, thusconnecting the intermediate shaft 3 withthe driven .shaft 2.

All three shafts thenv are rigidly connected with one another and the driving shaft imparts its motion to the driven shaft directly, as diagrammatically shown at A in Fig. 2.

In setting up the third speed B, the sleeves 18 and 29 are shifted to the left, whereby on one hand the fingers 28 are made to engage into the recesses 31,.thus rigidly connecting the wheel 30 with the second-motion shaft 2 1,

and on the other hand the sleeve 18 is placed into an overlapping position with respect to. corrugations l7 and 19, thus connecting the intermediate shaft 3 to the driven shaft 2. The driving shaft then imparts'its motion through gears 11 and 30 to the second-motion shaft which transmits same to the driven shaft through gears 27 and 15 according to line B of Fig. 2. c

In setting up the second speed 0, the sleeves 16 and 18 are thrown to the right, wherebyon one hand the fingers 14 are made to engage into the recesses 13, thus rigidly connecting the power shaft 1 to theintermediate shaft 3 and on the other hand the fingers 22 are introduced into the holes 21 driven shaft 2; the power shaft then transmits its motion through gears 15 and 27 to the second-motion shaft, thence to the driven shaft through gears 23 and 20 according to line C of Fig. 2.

In setting up the first speed D, the sleeves 18 and 29 are shifted to the right, thereby causing the engagement on one hand of fingers 28 into recesses 31, whereby the wheel 30 becomes rigidly connected to the secondmotion shaft 24, and on the other hand of fingers 22 into recesses 21, whereby the wheel 20 becomes rigidly connected to the driven shaft 2; the power shaft thus imparts the driving motion through gears 11 and 30 tothe second-motion shaft which, in turn, transmits it to the driven shaft through gears 23 and 20 according to line D of Fig. 2.

In setting up for backward running, the sleeve 29 is thrown to the right so as to engage fingers 28 into recesses 31 and, by shifting sleeve 29 further to the right, an intermediate pinion which is not shown in the drawing is, likewise thrown into engagement with gears 23 and 32. The power shaft 7 thus imparts its motion through gears 11 and 30 to the second-motion shaft, thence to the driven shaft through the gear 23, the intermediate gear and the gear 32 according to line E of the diagram shown in Fig. 2.

The operation of the sleeves and intermediate wheel may be providedfor, as usual, by means of forks actuated through a lever but, obviously, any other means might be used to secure the same result.

In Fig.3, the vertical lines a, b, 0, cl represent four pairs of gears whereby the direct running combinations may be secured. The gears for back'running, which is obtained in amanner similar to that described hereinbefore, are not shown.

The horizontal lines e and f represent the upper and lower shaft lines.

A, B, O, D, E, F, G, H show the connections of the various gears with'their shafts, corresponding to the direct running speeds,

there being provided eight such speeds in the case considered.

By comparing Figs. 2 and 3 it will be appreciated that the number of combinations increases rapidly in relation to the increase in the number of gears used, whereby a speed changing device may be obtained which provides a great number of speeds with few gears.

Claim:

A speed changing mechanism comprising on one and the same line a power gear, an intermediate gear and a driven gear, a driven shaft alined therewith, a second-motion shaft parallel with said line, two pinions secure-d upon said second-motion shaft and intermeshed with the intermediate and driven gears respectively, a loose second-motion pinthus rlgidly connecting the wheel 20 to the ion on said second-motion shaft, and coupling means adapted to eouplefirstly the power pinion with the intermediate gear;

secondly the intermediatejgear "with the driven shaft, thirdly the driven pinion'with said driven shaft and fourthly said second motion pinion with said seoond-motion shaft,

said means being operatable independently from one another.

In testimony whereof I have hereunto affixed my signature. V

CHARLES SCHAEFFER. 

